Fuel-charging pump



June 24, 1930. J. MAHLER FUEL CHARGING PUMP Filed March 8, 1926 fly 3 f6 fi w v 51 h w i fiQ a. "m i. 3 ii. m m a L 0 w n j I l 9 v J o0. Q DJ.P a m. 4 1 a lTUL/EHZUF lliy 2.,

L.-J L d I p e (WA fiUAN' aQ-Ztarne 5 Patented June 24, 1930 UNITEDSTATES PATENT orrlca JOHANN MAHLEB, OF AUGSIBURG, GERMANY, ASSIGNOB TOMASCHINENFABRIK AUGS- BURG-NUEBNIBERG, AKTIENGESELLSOHAFT, OF AUGSBUBG,GERMANY, A GERMAN CORPORATION FUEL-CHARGING PUMP Application filed March8, 1926. Serial No This invention relates to fuel charging pumps forcombustion engines and more particularly to the regulation of such pums. According to this invention the shaft, which :arries the cams foroperating the fuel pump, is made-of hollow conformation, and serves forreceivin the longitudinally displaceable governor ro which transmits theregulating motion to the pump. 7 By this arrangement 10 the necessity ofmounting the rod mechanism on the outside, which may easily give rise toa bending of the mechanism or other injuries thereof, will be obviatedand a simple and reliably operating construction will be the result.

By reason of the arrangement of the regulating rod inside of the hollowcamshaft the governor may be built into the driving gear for thecam-shaft, so that it will be positioned within the two-part gear-box.The dividing surface of the gear-box will thereby be positioned in thecenter of the cam-shaft.

It will thus also be possible to take the entire pump mechanism togetherwith the cam-shaft and the governor away from the engine solely byremovin a few screws, and

to eventually replace said pump mechanism by another. This is ofespecial importance for vehicle motors, in case the pump mechanism willbe damaged during travel. In this case the entire pump mechanism may bereplaced within a very short time, and a reserve pump mechanism insertedinstead thereof.

In the drawing an example of the new fuel charging pump according tothis invention is shown, Fig. 1 being a side view of the novel device,partly shown in longitudinal section, and Fig. 2 a section according toline A-B of Fig. 1.

The cam-shaft a, which carries the driving cams b for the operation ofthe pump pistons 0 of the fuel pump is made of hollow conformation. Thegovernor rod d is mounted within the cam-shaft a, said rod beingdisplaced under the influence of the governor during increase of thespeed of the engine above normal and again carried back into itsoriginal position during a decrease of the speed by action of the spring93,170, and in Germany February 11, 1926.

which surrounds the governor rod 05. The governor e is placed within thedriving gear g for the cam-shaft a and consists of two flyballs h, whichare rotating around the pivots z of the hub of the driving gear h andact upon the governor rod d by means of the angle arms 7'. The drivinggear 9 is mounted to ether with the governor e in a two-part gearox la,whose dividing surface 70", for reasons hereinafter explained, is in aplane with the axis of the cam-shaft a.

The governor rod d upon being adjusted by the governor e acts upon abell-crank lever m which is pivotally mounted at Z, said lever mtransmitting the motion to a rack n and by way of a gear 0 meshing withthe latter to a controlling shaft 1). Upon this shaft p there areeccentrically mounted levers g which act upon the overflow-valves s ofthe fuel pump by means of adjustable stops 1". If the speed of theengine rises above normal, the outwardly moving flyballs k of thegovernor e will cause a displacement of the governor rod 01 towards theleft, the bell-crank lever m will transmit the motion to the rack n andthe gear 0, whereby the shaft p will be rotated. By this the point ofrotation of the lever q will be lifted or lowered, so that the stop '1'will cause the overflow valve appertaining thereto to open sooner orlater, said valve causing the drawnin fuel to be by-passed to theoverflow chamber 8' during the remaining part of the stroke of the pumpand to thereby terminate the injections through the injection passage c.The levers extend beyond the stops r and are provided with rollers y, bymeans of which said levers act upon the pump piston 0. Besides, theselevers will be supported by means of rollers 02 on a plane runningsurface (012 provided on the levers t, which are again eccentricallymounted upon a regulating shaft 'w and con trolled by means of rollers ofrom the driving cams b of the cam-shaft a. The transmission of themotion of the cams b to the pump pistons 0, therefore, takes place byway of the levers t and 9. By rotating the shaft w the levers t areadjusted in longitudinal or horizontal direction and by this the moment,at which the rollers a) come in contact with the curved surface of thecams b will be changed and therewith also the moment at which theinjection commences.

In consequence of'the levers g belng supported by the plane surface w,the pos1t1on of these levers will not be influenced by the adjustment ofthe levers t.

The governor rod d will be acted upon in addition to the spring f by anauxiliary on said lever and adapted to cooperate with said relief valve.

3. A fuel pump for an internal combustion engine of the characterdescribed, comprising fuel feeding means, a hollow camshaft for drivingsaid fuel feeding means, means for adjusting the starting moment of thefuel injection, including an eccentrically mounted lever inter osedbetween said spring 1, which is mounted within a casing? cam-shaft andsaid fuel eeding means, and 2, and whose tension may be changed by;means for controlling the degree of fuel adscrewing the cover 3 of thecasing to a greater or smaller extent into or out of its guide 4. Bymeans of this spring the resistance offered by the governor rod (1against being adjusted may be changed at will, so that the actionexerted by the governor upon the adjustment of the admission will comeinto play only after the engine has attained a certain predetermined seed. The additional spring 1 will there ore act as a means forregulating the speed of the engine.

The entire fuel pump is mounted laterally of the engine frame 5 andrests u on the base 6, to which it is detachably astened by screws 7.After unscrewing these screws and removing the cover k of the gear-box,

the entire pump including governor e and driving gear 9 for thecam-shaft a may be taken off the engine and eventually replaced by aspare fuel pump, since the dividing surface of the gear-box is situatedin the same plane as the axis of the cam-shaft a. In this mannerinterruptions of the service for some longer time cannot take place, iftroubles arise in the fuel pump.

I claim:

1. A fuel pump for an internal combustion engine of the characterdescribed, comprising fuel feeding means, a hollow camshaft for drivingsaid fuel feeding means, and means for controlling the degree of fueladmission, said fuel admission controlling means including a governor, agovernor rod positioned within said hollow cam-shaft, a bell-crank leveroperated by said governor rod, a rack operated by said bell-crank lever,a gear meshing with said rack, and a controlling shaft fixed to saidgear adapted to transmit the motion of the governor rod to rock saidcontrolling shaft for adjusting the admission.

2. A fuel pump for an internal combustion engine of the characterdescribed, comprising fuel feeding means, a hollow camshaft for drivingsaid fuel feeding means, and means for controlling the degree of fueladmission, said fuel admission controlling means includinga governor, agovernor rod positioned within said hollow cam-shaft, a controllingshaft, a lever eccentrically arranged upon said controlling shaft, anoperative connection between said governor rod and said controllingshaft, a relief valve for mission, including a governor, a governor rodpositioned within said hollow cam-shaft, a second eccentrically mountedlever inter- \positioned between said cam-shaft and said fuel feedingmeans for controlling the admission, and an operative connection betweensaid governor rod and said second c-- centrically mounted lever.

4. A fuel pump for an internal combustion engine of the characterdescribed, comprising a pump plunger, a hollow cam-shaft for drivingsaid pump lunger, means for controlling the degree 0 fuel admissionincluding a overnor, a governor rod positioned within said hollowcam-shaft, a controlling lever for adjusting the admission, andoperative connections between said governor rod and said controllinglever; and means for controlling the beginning of fuel injection,including a regulating lever; said controlling lever and said regulatinlever being both interposed between sai camshaft and said pump plungerto transmit the motion of the cam-shaft to the pump plunger. 5. A fuelpump for an internal combustion engine of the character described,comprising means for controlling the beginning of fuel injection, andmeans for controlling the degree of fuel admission,said means includinga plurality of levers, apump plun er controlled by one of said levers, arelie valve controlled by another of said levers, a cam-shaft, saidlevers being interposed betweensaid cam-shaft and said pump plunger, oneof said levers having a plane surface with which another of said leverscontacts and through which motion is imparted from the cam-shaft to thepump plunger, andi means for adjusting the fulcrum points of said leversalong lines displaced a considerable distance apart.

6. A fuel pump for an internal combustion engine of the characterdescribed, comprising means for controlling the beginning of-fuelinjection, and means for controlling the degree of fuel admission, saidmeans including a plurality of adjacent levers, a pump plungercontrolled by one of said levers, a relief valve controlled by anotherof said levers, means for adjusting the fulcrum point of saidfirst-namedlever to vary the beginning of stroke of said pump plunger in relationto the cycle of engine operation means for adjusting the fulcrum point 0said second-named lever in a direction substantially 90 from thedirection of adjustment of the fulcrum point of the firstnamed lever tovary the degree of actuation of the relief valve, a cam-shaft, saidlevers being interposed between said camshaft and said pump plunger, oneof said levers having a plane surface extending substantially intheplane of adjusting movement of said lever, said other levercontacting with said plane surface and imparting therethrough movementto said pump plunger, the parts being so constructed as to permit thedegree of fuel admission and the beginning of fuel injection to bevariedindependently of each other. I

7 A fuel pump for an internal combustion engine of the characterdescribed, comprising means for controlling the beginning of fuelinjection, and means for controlling the degree of fuel admission, saidmeans including a plurality of levers, a pump plunger controlled by one.of said levers, a relief valve controlled by another of said levers,means for adjusting one of said levers to vary the beginning of strokeof said pump plunger in relation to the cycle 'of engine operation,means for adjusting another of said levers in a direction substantially90 from the adjustment direction of said one lever to vary the degree ofactuation of said relief valve, a camshaft, a driving connection betweensaid cam-shaft and said first-named lever, said first-named lever havinga plane surface thereon extending substantially in the plane ofadjusting movement of said lever, a driving connection between saidsecondnamed lever and said plane surface, and a driving connectionbetween said secondnamed lever and said pump plunger, said parts beingso constructed that ad ustmentof either lever and consequent movement ofits associated parts imparts substantially no change of adjustment tothe other lever and its associated parts.

8. A fuel pump for an internal combus prising means for controlling thebeginning of fuel injection, and means for controlling the degree offuel admission, said means including a plurality of eccentricallymounted levers, a pump plun er, a relief valve, one of saidlevers'contro ling the beginning of actuation of said pump plunger inrelation to the cycle of engine operatlon to control the beginning offuel injection, an adjustable sto carried by another of said leversadapte to cooperate with said relief valve to control the degree of fueladmission, means for adjusting said first-named lever on its eccentricmounting to var the beginning of actuation of said pump p unger, meansfor adjusting said secondnamed lever on its eccentric mounting in adirection substantially at right-angles to the direction of adjustingmovement of said first-named lever to vary the degree of actuation ofsaid relief valve, a cam-shaft, a roller carried by said first-namedlever in driving connection with said cam-shaft, said first-named'leverhaving a plane surface thereon extending substantially in the directionof its adjusting movement, a roller carried by said second-named leverin driving engagement with said plane surface, and a second rollercarried by said second-named lever in driving connection with said pumpplunger, the parts being so constructed that the be inning. of fuelinjection and the degree 0 fuel admission may be adjusted independentlyof each other.

9. In an internal combustion engine of the character described having anengine frame, a fuel pump detachably mounted on said engine frame, ahollow driving shaft for said pump extending to the exterior of saidpump, a hollou driving gear mounted adjacent one end of said shaft onthe exterior of said pump; a governor for said pump including a governorrod positioned within said hollow driving shaft, and a-governor weightpositioned within said hollow driving gear and operatively connectedwith said governor rod; and a twopart gear case enclosing said shaftend, driving gear and said associated governor parts, the constructionbeing such as to permit said pump, driving shaft, driving gear, andovernor to be dismounted from or mounte on 1n, a controlling shaftmounted within said casing, for controlling the degree of fueladmission, a hollow cam-shaft within said casing spaced from saidcontrolling shaft and paralleled therewith, a governor rod within saidhollow cam-shaft, a governor weight at one end of said governor rod foractuat- .ing the same, and an operative connection tion engine of thecharacter described, com-.

in said casing at the other end of said governor rod between saidcontrollingshaft and said governor rod, the construction being such asto permit the removal of the pump as a unit with the controlling shaft,hollow cam-shaft, governor rod and said operative connection in theiroperative assembled positions. 4

In testimony whereof I have aflixed my signature.

JOHANN MAHLER,

